Jack has 5 cats and 1 dog. If the dog`s weight is 3 times the average (arithmetic mean) weight of the cats, then the dog`s weight is what fraction of the total weight of all 6 animals?
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A$$\frac{1}{4}$$
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B$$\frac{1}{3}$$
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C$$\frac{3}{8}$$
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D$$\frac{3}{7}$$
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E$$\frac{3}{5}$$
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正确答案: C